Zoology - Online Test
Q1. Element located in centre of pophyrin ring of chlorophyll is
Answer : Option C
Explaination / Solution:
Chlorophyll molecule consists of a porphyrin ring and a long tail like chain of carbon and hydrogen. The centre of pophyrin ring is occupied by Mg ions.
Q2. Which of the following organisms not fix atmospheric nitrogen
Answer : Option C
Explaination / Solution:
Spirogyra is a filamentous alga. This alga does not fix atmospheric nitrogen. Anabaena, Nostoc and Oscillatoria can heterocyst that can fix atmospheric nitrogen.
Q3. In the human heart :
i. The valve between right atrium and right ventricle is tricuspid while valve between left atrium and left ventricle is mitral valve.
ii. Openings of the right and the left ventricles into the pulmonary artery and the aorta are guarded by semilunar valves.
iii. ‘Lub’ the first sound which is low pitched is caused by the closure of semilunar valves while ‘Dub’ the second sound which is high pitched is caused by the closure of bicuspid and tricuspid valves.
i. The valve between right atrium and right ventricle is tricuspid while valve between left atrium and left ventricle is mitral valve.
ii. Openings of the right and the left ventricles into the pulmonary artery and the aorta are guarded by semilunar valves.
iii. ‘Lub’ the first sound which is low pitched is caused by the closure of semilunar valves while ‘Dub’ the second sound which is high pitched is caused by the closure of bicuspid and tricuspid valves.
Answer : Option A
Explaination / Solution:
The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves whereas the second heart sound (dub) is associated with the closure of the semilunar valves.
Q4. Spraying of DDT produces pollution of
Answer : Option C
Explaination / Solution:
Spraying of DDT produces pollution of air, water and soil. DDT is used as pesticides in agricultural field. It is non-biodegradable and reach to water bodies to pollute it. Some DDT also remains present in air as mist.
Q5. The complex formed by a pair of synapsed homologous chromosomes is called
Answer : Option D
Explaination / Solution:
The complex formed by a pair of synapsed homologous chromosomes is called a bivalentor a tetrad. However, these are more clearly visible at the Prophase1 of Meiosis-1.
Q6. The property of Taq polymerase explored in PCR is
Answer : Option D
Explaination / Solution:
Taq polymerase is a thermostable DNA polymerase. Taq polymerase is an enzyme that copies DNA. It is isolated from a heat-loving bacterium that is naturally found in hot springs, so the enzyme doesn't break down at the high temperatures necessary for copying DNA using a polymerase chain reaction.
Q7. Select the mismatched pair of the following :
Answer : Option D
Explaination / Solution:
Cortical nephron is about 25% of total nephrons. Glomerular filtration rate is 180 litre per day. Juxtamedullary nephron makes about 15% of total nephrons but lung do not removes 180 L of carbon dioxide per day.
Q8. Lichen can be used as industrial pollution indicators because
Answer : Option C
Explaination / Solution:
The hardy lichens are useful bioindicators for air pollution, espeially sulfur dioxide pollution, since they derive their water and essential nutrients mainly from the atmosphere rather than from the soil. It also helps that they are able to react to air pollutants all year round. Lichens are symbiotic association between algae and fungi.
Q9. In taxonomic hierarchy, the various categories are arranged in
Answer : Option A
Explaination / Solution:
Kingdom -> Phylum/Division -> Class -> Order -> Family -> Genus -> Species. Hence, the correct option is Descending order.
Q10. Universal non-polluting source of energy is
Answer : Option A
Explaination / Solution:
Universal non-polluting source of energy is sun. All the sources of energy are directly and indirectly derived from sun including fossil fuels.
